As expected, no internet address on wlan0 which would explain no scan results I would imagine...

No, the fact that you have wlan0 would suggest that the driver is loaded and the dongle is recognised.

However, I just had a similar thing happening when I played around with the internal wifi on a Pi3B.
'iwlist scan' shows absolutely nothing
I went into the GUI and clicked on the network icon in the taskbar. At first still nothing showing up, but then all of a sudden APs starting appearing.
From then on 'iwlist' would also show the APs... weird.
After a reboot the same happens.

I added the credentials manually to /etc/wpa_supplicant/wpa_supplicant.conf and wifi connects without problems.

I went into the GUI and clicked on the network icon in the taskbar. At first still nothing showing up, but then all of a sudden APs starting appearing. From then on 'iwlist' would also show the APs... weird.

Ok... tried this too. APs never started appearing for me. However, my eth0 does appear when plugged in. Bonus! ... But no wifi APs unfortunately.

I added the credentials manually to /etc/wpa_supplicant/wpa_supplicant.conf and wifi connects without problems.

Hmm... I had added my creds to the wpa_supplicant.conf also. Still no dice. :-/

I am trying to run the tp-link archer t2u adapter and I use the install-wifi, and the adapter recognizes the networks, but I can not connect, they all appear without signal. What can I do in this case?

I leave image (any necessary data will be attentive to the subject). And i Use a Rpi3

I had problems with using wlan0 and wlan1. I had to switch to predictable interface names when using two wifi devices. I couldn't predict which interface would get which name. Sometimes the onboard interface would be wlan0, and other times wlan1.

Predictable names are a pain in the backside, but I found necessary when using multiple wifi devices

As this thread is for the Archer T1U it would have been better if you had started a new thread for the Archer T2U.

I have not used the GUI for a long, long time so not sure on the setup. Don't you just have to select the network you want to connect to and then you will be asked for the password.

but, i need desactivate the wlan0? or only i need is configure the wlan1 in the respective files?

I run several Pi with more than one wifi module without problems. I am away from home at the moment but I have a Pi 3B running Jessie and a Pi 0 W running Stretch with me.

On the Pi 3B I have disabled the built in wifi and it has a USB wifi module so it has just one wifi connected. On the Pi 0 W I have the built in wifi and a USB wifi adapter connected and both are connected to the router. I find the built in wifi always gets the name wlan0 and the USB wifi gets the name wlan1.

If you don't want to use the built in wifi you can disable it then when you reboot the T2U will get the name wlan0.

Simplicity is a prerequisite for reliability. Edsger W. Dijkstra

Please post ALL technical questions on the forum. Please Do Not send private messages.

MrEngman wrote:
On the Pi 3B I have disabled the built in wifi and it has a USB wifi module so it has just one wifi connected. On the Pi 0 W I have the built in wifi and a USB wifi adapter connected and both are connected to the router. I find the built in wifi always gets the name wlan0 and the USB wifi gets the name wlan1.

That is what I thought also. I found, to my embarrassment, it isn't true. On occasion, my onboard wlan gets wlan1 and the usb wlan gets wlan0.

MrEngman wrote:
On the Pi 3B I have disabled the built in wifi and it has a USB wifi module so it has just one wifi connected. On the Pi 0 W I have the built in wifi and a USB wifi adapter connected and both are connected to the router. I find the built in wifi always gets the name wlan0 and the USB wifi gets the name wlan1.

That is what I thought also. I found, to my embarrassment, it isn't true. On occasion, my onboard wlan gets wlan1 and the usb wlan gets wlan0.

That Right !, I had the same problem, when I rebooted the raspberry, I saw how devices were exchanged between wlan0 and wlan1

MrEngman wrote:
On the Pi 3B I have disabled the built in wifi and it has a USB wifi module so it has just one wifi connected. On the Pi 0 W I have the built in wifi and a USB wifi adapter connected and both are connected to the router. I find the built in wifi always gets the name wlan0 and the USB wifi gets the name wlan1.

That is what I thought also. I found, to my embarrassment, it isn't true. On occasion, my onboard wlan gets wlan1 and the usb wlan gets wlan0.

That Right !, I had the same problem, when I rebooted the raspberry, I saw how devices were exchanged between wlan0 and wlan1

Very easy to disable the built in wifi so you only have the T2U active which will then get the name wlan0.

Anyone who stumbles upon this later, I finally got this working with MrEngman's AMAZING script which you just run and it installs exactly the right version for your kernel version. Follow the instructions at the top of the script. Did what I was trying to do for hours in a minute. [headdesk]

I disabled wlan onboard and nothing, i cant connect, and show all the connection with low signal

I'm having this exact problem trying to use my T2U on raspbian stretch kernel 4.9.41-v7+

The drivers download and install and even starts to work, but it's unable to visualize signal strength or connect to networks. It also seems to panic the pi3b and makes it unreachable and unresponsive via ash or VNC after about 10 minutes.

Is there an issue with the script or the compiled driver that wants to be on Jessie and not Stretch?

I'm having this exact problem trying to use my T2U on raspbian stretch kernel 4.9.41-v7+

The drivers download and install and even starts to work, but it's unable to visualize signal strength or connect to networks. It also seems to panic the pi3b and makes it unreachable and unresponsive via ash or VNC after about 10 minutes.

Is there an issue with the script or the compiled driver that wants to be on Jessie and not Stretch?

at the end i give up with this adapter. not worked with anything what i tried